Affiliation: | (1) The Lyle Building, School of Biological Sciences, The University of Reading, Reading, RG6 6AS, UK;(2) Present address: Ume? Plant Science Centre, Swedish Agricultural University, Umea, 90183, Sweden;(3) Finnish Forest Research Institute METLA, Jokiniemenkuja 1, P.O. Box 18, 01301 Vantaa, Finland |